Blender Git Loki

Fix #22894

[#22894] SEQUENCER; Drag & Drop into VSE as strip sends user to
file manager for import - MS Windows

The invoke function for both operator don't check the the filepath
property (this come from the drop event), so always open the
file browser.

Note that this problem is still there for Image, but there is something
else there, because the op SEQUENCER_OT_image_strip_add never got
this property (filepath). I check and the problem seems to be the
missing WM_FILESEL_FILEPATH when call WM_operator_properties_filesel.

The problem is that if I put this flag in the function, the image
strip stop working, so have to check a little more about this.
(Any idea why ?)